Nut-turning machine



UNITED STATES PATENT OFFIQE.

NUT-TURNING MACHINE.

Specification ofLetters Patent.

Patented Jan. a, 1:221.

Application filed February 10, 1919. Serial No. 276,027.

To all whom it may concern:

Be it known that I, ALVA F.- MULLAN, a citizen of the United States, andresident of the city of Tacoma, county of Pierce, and State ofIVashington, have invented certain new and useful Improvements inNut-Turning Machines, of which the following is a specification.

My invention relates to mechanisms which are intended for use in turningup nuts upon bolts and is designed particularly for use in shipyards fordoing the work, which is ordinarily referred to as bolting-up.

The object of my invention is to provide a means whereby the turning upof the nuts upon the bolts used in temporarily securing together theplates, frames and other parts of a ship, may be done by a device whichuses power.

My invention consists of certain novel parts and combination of parts,which have been illustrated in the accompanying drawlugs and which willbe described in the following specification and then particularlydefined in the claim.

In the accompanying drawings I have shown my invention embodied in theform of construction, which is now most preferred by me.

Figure 1 is a side view in use.

Fig. 2 is a longitudinal section through the same.

Fig. 3 is a section taken upon the line 3--3 of Fig. 1.

Fig. 4 is a section taken upon a line iel of Fig. 1.

In the construction of ships, the work which is called bolting-up formsa considerable part of the Work. This consists in temporarily securingtogether the parts of the vessel, by the use of bolts. In this work, itis necessary to draw the parts closely into contact by turning up thenuts on the bolts, for the reason that the plates must be in closecontact at the time of inserting the rivets. To do this by hand, takes agreat deal of time and a corresponding expense for labor. It is tofacilitate this work that my invention has been produced.

The operating parts of my invention consist principally of two parts-asleeve 1 and a shaft 2. The sleeve 1 is internally threaded and theshaft 2, exteriorly threaded, so that the shaft will screw into thesleeve, the threads upon 2 being complemental. These of my device shownthreads have a high pitch. In the apparatus illustrated, the shafts andthe sleeve are provided with four threads. The pitch of these threadsshould be such that rotative movements may be communicated from one tothe other by a relative longitudinal movement.

The sleeve 1 has a second sleeve 3 secured thereto and constituting asocket wrench. The hole in this wrench should be of a size and shape tofit the nuts upon which the device is being used. The depth of the hole30 therein should be sufficient to ilCCOIIlDIudate the length of bolt,which may be expected to project beyond the nut. The threaded sleeve 1and the socket wrench 3 are shown as secured together by a tip 10 ofreduced diameter upon the sleeve 1, which enters a recess in the upperend of the socket wrench. The wrench member 3 is also provided with acollar 31, upon which rests the central part 5 of a foot rest by whichthe device may be held down upon the work, if this be desired ornecessary.

The upper end of the shaft 2 has a head 20, which enters a clampingsleeve 60, by

which it may be secured to the outer end of a casing sleeve 6, whichforms a part of an ordinary pneumatic hammer. Within this sleeve is acylinder 61, which forms the anvil or member interposed between thereciprocating hammer 62 and the shaft 2.

In use, the shaft 2 is drawn out until the greater part thereof isprojecting from the sleeve 1. The socket wrench 3 is then placed uponthe nut. The air is then turned upon the pneumatic hammer and this, byapplying blows to the outer end of the shaft, forces it into thesleeve 1. The pneumatic hammer is held against turning. To facilitatethis, a handle, as 7 may be applied thereto. As the shaft 2 cannot turn,the sleeve 1 must turn and in doing so turns the nut 40. The nut isthusturned an amount equivalent to the turns given the sleeve in onecomplete reciprocation of the shaft 2. The device is then removed fromthe nut, the shaft 2 withdrawn, the device again applied to the nut andthe shaft driven into the sleeve again. In this way the nut is rapidlyand powerfully turned up.

To prevent the possibility of the shaft 2 being entirely removed fromthe sleeve 1, I have provided pins 8, mounted to reciprocate in a radialdirection in the outer end of the sleeve 1. These are normally heldinward by springs, as 80, and the pins 8 project into the threads of theshaft 2. Near the inner end of the shaft 2 are recesses 20, which haveinclined bottom surfaces, with an abrupt wall at their lower ends intowhich the pins will drop, thus preventing entire removal of the shaftandat the same time offering no objection to the inward movement thereof.

It will be seen that the chief feature of this invention is the use ofthe shaft and sleeves 2 and 1, having complemental threads of highpitch, and the turning of the outei sleeve 1, by the application ofblows to the outer end of the shaft, through the action of 15 apneumatic hammer.

What I claim as my invention is: I A spiral drlvlng mechanism comprisinga shaft and a sleeve rotatively mounted there on, said shaft and sleevehaving complemental threads of high pitch, means for holding said shaftagainst rotation, the outer end of said shaft being adapted to receiveblows lengthwise the shaft, a pin mounted in said sleeve and slidableradially thereof, a spring bearing against the outer end of said pin andadapted to force said pin in ward, the inner end of said pin bearingagainst said shaft and a stop on said shaft near its inner enc adaptedto engage said pin to prevent further extraction of the shaft.

Signed at Tacoma, Pierce county, VVashington, this 29th day of January,1919.

' ALVA F. MULLAN.

